93 lines
2.3 KiB
JavaScript
93 lines
2.3 KiB
JavaScript
const express = require('express');
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const cors = require('cors');
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const mysql = require('mysql');
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const app = express();
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const port = 8000;
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// 允许所有来源的请求
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app.use(cors());
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// 创建 MySQL 连接
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const db = mysql.createConnection({
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host: '172.17.0.1',
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user: 'RQteafactory',
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password: 'Guoswork105',
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database: 'RQteafactory'
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});
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// 连接数据库
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db.connect((err) => {
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if (err) {
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console.error('MySQL connection error: ', err);
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return;
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}
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console.log('MySQL connected...');
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});
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// 折线图获取数据库数据
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function getSensorData(callback) {
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const sql = 'SELECT timestamp, temperature, humidity, co2, pressure FROM sensor_data';
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db.query(sql, (err, results) => {
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if (err) {
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console.error('Error fetching sensor data: ', err);
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callback({ error: 'Error fetching sensor data' });
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return;
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}
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const timestamps = results.map(row => new Date(row.timestamp).toISOString().slice(0, 19).replace('T', ' '));
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const temperatures = results.map(row => row.temperature);
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const humidities = results.map(row => row.humidity);
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const co2 = results.map(row => row.co2);
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const pressure = results.map(row => row.pressure);
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callback({
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timestamps,
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temperatures,
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humidities,
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co2,
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pressure
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});
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});
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}
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// 获取数据库中最新的数据
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function getLatestSensorData(callback) {
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const sql = 'SELECT temperature, humidity, co2, pressure,timestamp FROM sensor_data ORDER BY id DESC LIMIT 1';
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db.query(sql, (err, results) => {
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if (err) {
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console.error('Error fetching latest sensor data: ', err);
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callback({ error: 'Error fetching latest sensor data' });
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return;
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}
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const data = results[0];
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const timestamps = results.map(row => new Date(row.timestamp).toISOString().slice(0, 19).replace('T', ' '));
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callback({
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temperatures: data.temperature,
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humidity: data.humidity,
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co2: data.co2,
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pressure: data.pressure,
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timestamps
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});
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});
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}
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// 获取数据
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app.get('/get_sensor_data', (req, res) => {
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getSensorData(data => {
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res.json(data);
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});
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});
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// 获取最新的数据
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app.get('/get_latest_sensor_data', (req, res) => {
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getLatestSensorData(data => {
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res.json(data);
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});
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});
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// 启动服务器
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app.listen(port, () => {
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console.log(`Server running on http://0.0.0.0:${port}`);
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}); |